There's a good overview here: http://wiki.davincidsp.com/index.php?title=Cache_Management
... which includes a section on common cache errors and some details about Codec Engine's support for cache management. Chris ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Griffis, Brad Sent: Sunday, June 29, 2008 1:55 PM To: amr ali; davinci-linux-open-source@linux.davincidsp.com Subject: RE: Cache Coherency between ARM core and DSP Be careful with your cache operations. A WB-inv is not the "catch all" operation. You can do some damage if you do it in the wrong place. A few hints/tips: * Make sure that only one of the processors is accessing the data at any given time. * Before touching a buffer for the first time the processor should do a "block invalidate" to make sure it doesn't have any old data corresponding to that address range. * After finishing work with a buffer the processor should do a "block writeback (invalidate)" to push all the new data out to DDR. FYI, I'm speaking pretty generically with my above comments. I'm not sure what cache operations are already being performed by Codec Engine, DSP Link, Framework Components, etc. Someone else may comment on those specifically. It would be helpful if you share your motivations for doing these cache operations. Are you having cache coherence issues? If you share more about why you're doing it we might be able to make enhancements in Codec Engine to help you out. They might even already exist! Brad ________________________________ From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of amr ali [EMAIL PROTECTED] Sent: Sunday, June 29, 2008 2:53 AM To: davinci-linux-open-source@linux.davincidsp.com Subject: Cache Coherency between ARM core and DSP Hi, If I want to perform cache coherency my self on some data I pass from ARM to DSP and vice-versa, what should I do? A suggested scenario is to make the following modifications in ARM code: WB cache & invalidate it VISA API WB cache & invalidate it again Your suggestions are welcome. Should I do same thing in DSP code? BR, Amr Ali. ________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! Try it!<http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us>
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